Mr. Johnson noted that 3/8 of the students at his school were in the band. He also noted that 1/2 of the students in the band were girls. What fractional part of the students at the school were girls in the band?

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b